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Yamaha 25A Owner's Manual

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25A
30A
OWNER'S MANUAL
U.S.A.Edition
LIT-18626-04-54

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Summary of Contents for Yamaha 25A

  • Page 1 OWNER’S MANUAL U.S.A.Edition LIT-18626-04-54...
  • Page 3 EMU01449 TO THE OWNER Thank you for choosing a Yamaha out- board motor. This Owner’s manual con- A CAUTION indicates special precautions tains information needed for proper oper- that must be taken to avoid damage to ation, maintenance and care. A thorough the outboard motor.

  • Page 5: Table Of Contents

    EMA20010 CONTENTS GENERAL INFORMATION BASIC COMPONENTS OPERATION MAINTENANCE TROUBLE RECOVERY INDEX READ THIS OWNER’S MANUAL CAREFULLY BEFORE OPERATING YOUR OUTBOARD MOTOR.

  • Page 7: General Information

    EMB00010 Chapter 1 GENERAL INFORMATION IDENTIFICATION NUMBERS RECORD ..1-1 Outboard motor serial number...1-1 Key number...........1-1 EMISSION CONTROL INFORMATION...1-2 SAFETY INFORMATION......1-3 IMPORTANT LABELS ......1-5 BASIC BOATING RULES ......1-6 FUELING INSTRUCTIONS.....1-10 Gasoline (petrol).........1-11 Engine oil ..........1-11 BATTERY REQUIREMENT ....1-12 PROPELLER SELECTION .......1-13 START-IN-GEAR PROTECTION ....1-14...

  • Page 8: Identification Numbers Record

    Record your outboard motor serial num- 401012 ber in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or for reference in case your out- board motor is stolen. 1 Outboard motor serial number...

  • Page 9: Emission Control Information

    EMU01385 EMISSION CONTROL INFORMATION EMU01386 NORTH AMERICAN MODELS This engine conforms to U.S. Environ- mental Protection Agency (EPA) regula- 108021 tions for marine SI engines. See the label affixed to your engine for details. 25-3/30 Approval label of Emission control certificate This label is attached to the bottom cowl- ing.

  • Page 10: Safety Information

    8 This product emits exhaust gases which EMU00917 SAFETY contain carbon monoxide, a colorless, INFORMATION odorless gas which may cause brain damage or death when inhaled. Symp- toms include nausea, dizziness, and 8 Before mounting or operating the out- drowsiness. Keep cockpit and cabin board motor, read this entire manual.
  • Page 11 8 When a swimmer is in the water near you shift into neutral and shut off the engine. 8 Be informed about boating safety. Addi- tional publications and information can be obtained from many organizations, including the following: United States Coast Guard Consumer Affairs Staff (G-BC) Office of Boating, Public, and Consumer Affairs...

  • Page 12: Important Labels

    LOCATION EMB30010 IMPORTANT LABELS WARNING LABELS WARNING Be sure shift control is in neutral before starting engine. (except 2HP) Do not touch or remove electrical parts when starting or during operation. 202023 Keep hands,hair,and clothes away from flywheel and other rotating parts while engine is running. 6A1-83625-41 25-3/30 WARNING...

  • Page 13: Basic Boating Rules

    EMB40010 Stand-on vessel BASIC BOATING RULES The vessel with the right-of-way has the duty to continue its course and speed, (Rules of the road) except to avoid an immediate collision. When you maintain your direction and Just as there are rules which apply when speed, the other vessel will be able to you are driving on streets and high ways, determine how best to avoid you.
  • Page 14 RULES WHEN ENCOUNTERING side. This rule doesn’t apply if both of you will clear one another if you continue on VESSELS your set course and speed. There are three main situations which you may encounter with other vessels which could lead to a collision unless the Steer- ing Rules are followed: Meeting (you are approaching another vessel head-on)
  • Page 15 the other vessel is expected to maintain Sailing vessel right-of-way its course and speed. You must stay out Sailing vessels should normally be given the right-of-way. The exceptions to this of its way until you are clear of it. Like- are: wise, if another vessel is passing you, you should maintain your speed and direction...
  • Page 16 tion. These markers are white with black letters and orange boarders. They signify speed zones, restricted areas, danger areas, and general information. Remember, markings may vary by geo- graphic location. Always consult local boating authorities before driving your boat in unfamiliar waters. MAIN CHANNEL BUOYS "...

  • Page 17: Fueling Instructions

    EMU00016 FUELING INSTRUCTIONS GASOLINE AND ITS VAPORS ARE HIGH- LY FLAMMABLE AND EXPLOSIVE! 8 Do not smoke when refueling, and keep away from sparks, flames, or other sources of ignition. 8 Stop engine before refueling. 8 Refuel in a well-ventilated area. Refuel portable fuel tanks off the boat.

  • Page 18: Gasoline (Petrol)

    EMU00018 GASOLINE (PETROL) Recommended gasoline: Regular unleaded gasoline with a minimum octane rating of 86 (Pump Octane Number) = (R+M)/2 If knocking or pinging occurs, use a differ- ent brand of gasoline or premium unlead- ed fuel. If unleaded gasoline is not avail- able, then leaded regular gasoline can be used.

  • Page 19: Battery Requirement

    18 volts or higher with the above models. Consult your Yamaha dealer for details on installing an optional rectifier regulator. Choose a battery for electric start models which meets the following specifications.

  • Page 20: Propeller Selection

    Conversely, a larger-pitch pro- peller is more suitable for a smaller oper- ating load. Yamaha dealers stock a range of pro- pellers, and can advise you and install a propeller on your outboard that is best suited to your application.

  • Page 21: Start-In-Gear Protection

    3 Type of propeller (propeller mark) Refer to the section “CHECKING PRO- PELLER” for instructions on propeller 602016 removal and installation. EMU01209 START-IN-GEAR PROTECTION Yamaha outboard motors or Yamaha approved remote control units equipped with start-in-gear protection device(s). This feature permits the engine to be started only when it is Neutral.
  • Page 22 -MEMO-...

  • Page 23: Basic Components

    EMC00010 Chapter 2 BASIC COMPONENTS MAIN COMPONENTS......2-1 OPERATIONS OF CONTROLS AND OTHER FUNCTIONS ........2-3 Fuel tank ..........2-3 Gear shift lever ........2-3 Engine stop lanyard switch ....2-4 Engine stop button.......2-5 Tiller handle ..........2-5 Choke knob ...........2-6 Recoil starter handle ......2-6 Starter button........2-7 Remote control ........2-7 Steering friction adjusting screw..2-10 Trim tab ..........2-11...

  • Page 24: Main Components

    EMU01206 MAIN COMPONENTS 101061 1 Recoil starter handle e Trim angle adjusting-rod 2 Choke knob r Rope attachment 3 Warning lamp t Shallow water lever 4 Gear shift lever y Fuel tank 5 Throttle-control grip/Tiller-handle * May not be exactly as shown; also may 6 Engine stop button/ not be included as standard equipment on Engine stop lanyard switch...
  • Page 25 EMU01206 MAIN COMPONENTS 25-3/30 101113** 701061 101111 1 Top cowling e Engine stop button/Engine stop lanyard 2 Tilt-lock lever switch 3 Transom-clamp handle r Warning lamp 4 Anti-cavitation plate * t Gear shift lever 5 Trim tab * y Throttle-control grip/tiller handle 6 Cooling water inlet * u Shallow water lever 7 Propeller...

  • Page 26: Operations Of Controls And Other Functions

    EMC20010 OPERATIONS OF CONTROLS AND OTHER FUNCTIONS EMC21012 FUEL TANK If your model was equipped with a portable fuel tank, its function is as fol- lows. 1 Fuel hose joint 2 Fuel meter(If equipped) 3 Fuel tank cap 4 Air vent screw(If equipped) Fuel hose joint This connector is provided for connecting or disconnecting fuel hose.

  • Page 27: Engine Stop Lanyard Switch

    EMC28111 ENGINE STOP LANYARD SWITCH (for Tiller control model) The lock-plate on the end of the lanyard must be attached to the engine stop switch for the engine to run. The lanyard should be attached to a secure place on the operator’s clothing, or arm or leg.

  • Page 28: Engine Stop Button

    EMC27011 25-3/30 ENGINE STOP BUTTON (for Tiller control model) Pushing this button opens the ignition cir- cuit and stops the engine. EMU00062 TILLER HANDLE (for Tiller control model) Moving the tiller handle sideways to adjust the steering direction. In addition, this handle contains the functions as fol- lows.

  • Page 29: Choke Knob

    EMU01293 Throttle friction adjusting screw/ knob A friction device in the tiller handle pro- vide resistance to movement of the throt- tle grip. This is adjustable for operator preference. An adjusting screw/knob is located within the tiller handle. 502011 Resistance Knob/Screw Increase Turn clockwise...

  • Page 30: Starter Button

    EMC46010 STARTER BUTTON (for Tiller control model) When you push the starter button, the electric starter motor cranks the engine to start it. 306014 EMU00090 REMOTE CONTROL Both the shifter and the throttle are actu- ated by the remote control lever. In addi- tion, this remote control also has the elec- trical switches.
  • Page 31 Neutral interlock trigger To shift out of Neutral, the neutral inter- lock trigger of the remote control lever must first be pulled up. 701036 Neutral throttle lever To open the throttle without shifting into either Forward or Reverse, place the remote control lever in the Neutral posi- tion and lift the neutral throttle lever.
  • Page 32 EMC50310 Choke switch While the main switch is being pressed in START at “ON” or “START”, the choke system will switch on, to supply a rich mixture required to start the engine. (When the key is released, it will switch off automatically.) 701042 EMU00934 Engine Stop Lanyard Switch...

  • Page 33: Steering Friction Adjusting Screw

    EMU01155 Throttle Friction Adjusting Screw A friction device in the remote control box provides adjustable resistance to move- ment of the remote control lever, and can be set according to operator preference. An adjusting screw is located on the front of the remote control box.

  • Page 34: Trim Tab

    EMU00113 TRIM TAB The trim tab should be adjusted so that the steering control can be turned to either the right or left by applying the same amount of force. An improperly adjusted trim tab may 603011 cause difficult steering. Always test run after the trim tab has been installed or replaced to be sure steering is correct.

  • Page 35: Shallow Water Lever

    EMD08010 SHALLOW WATER LEVER (If equipped) Lifting this lever will tilt the motor up par- tially to provide more clearance when operating in shallow water. 402075* EMD08110 25-3/30 SHALLOW WATER LEVER (If equipped) 25-3/30 Pushing this lever down will tilt the motor up partially to provide more clearance when operating in shallow water.

  • Page 36: Tilt Support Bar

    EMU00156 TILT SUPPORT BAR The tilt support bar 1 keeps the outboard motor in the tilted up position. 403023 EMD60210 25-3/30 TILT SUPPORT LEVER 25-3/30 To keep the outboard motor in the tilted- up position, lock the tilt support lever to the swivel bracket.

  • Page 37: Warning System

    EMD80010 WARNING SYSTEM Do not continue to operate the engine if the warning device has activated. Consult your Yamaha dealer if the problem can- not be located and corrected. EMU00170 OVERHEAT WARNING This engine has an overheat warning device. If the engine temperature rises too high, the warning device will activate.

  • Page 38: Oil Level Warning / Oil Filter Clogging Warning

    EMU00172 OIL LEVEL WARNING / OIL FILTER CLOGGING WARNING This engine has an oil level warning sys- tem. If oil level falls below lower limit, the warning device will activate. ); Included ( ); N/A — Warning device Tiller Remote activation control control...
  • Page 39 Oil level warning system The various oil-level warning system functions are as follows: Oil level warning indicator lamp Engine oil tank Remarks (Bottom cowling) more than 200 cm (0.21 US qt, No refilling necessary. 0.181 Imp qt) 200 cm or less (0.21 US qt, 0.181 Buzzer sounds in remote control Imp qt) box and engine speed is limited...
  • Page 40 -MEMO-...

  • Page 41: Operation

    EMF00010 Chapter 3 OPERATION INSTALLATION ........3-1 Mounting the outboard motor....3-2 Clamping the outboard motor..3-4, 3-5 FILLING FUEL AND ENGINE OIL ....3-6 Filling fuel..........3-6 Filling oil ..........3-7 Gasoline (petrol) and oil mixing ..3-9 PRE-OPERATION CHECKS....3-11 Operation after a long period of storage..........3-12 BREAKING IN (RUNNING IN) ENGINE ...........3-13...

  • Page 42: Installation

    EMF10010 INSTALLATION Incorrect engine height or obstructions to smooth water flow (such as the design or condition of the boat or accessories such as transom ladders/depth finder trans- ducers) can create airborne water spray while the boat is cruising. Severe engine damage may result if the motor is operat- ed continuously in the presence of air- borne water spray.

  • Page 43: Mounting The Outboard Motor

    EMU00176 MOUNTING THE OUTBOARD MOTOR Improper mounting of the outboard motor could result in hazardous condi- tions such as poor handling, loss of con- trol, or fire hazards. Observe the follow- ing: 8 The information presented in this sec- tion is intended as reference only. It is possible provide complete...
  • Page 44 Overpowering a boat may cause severe instability. Do not install an outboard motor with more horsepower than the maximum rating on the capacity plate of the boat. If the boat does not have a capacity plate, consult the boat manufac- turer.

  • Page 45: Clamping The Outboard Motor

    EMF14010 CLAMPING THE OUTBOARD MOTOR 1) Place the outboard on the transom so that it is positioned as close to the center as possible. Tighten the tran- som clamp screws evenly and secure- ly. Check the clamp-screws for tight- ness occasionally during operation of the motor as they can work loose due 409011 to engine vibration.
  • Page 46 EMU01318 CLAMPING THE OUTBOARD MOTOR 30EH/30ER 1) Place the outboard on the transom so that it is positioned as close to the center as possible. Tighten the tran- som clamp screws evenly and secure- ly. Check the clamp-screws for tight- ness occasionally during operation of 409011 the motor as they can work loose due...

  • Page 47: Filling Fuel And Engine Oil

    EMF30010 FILLING FUEL AND ENGINE OIL FILLING FUEL 1) Remove the fuel tank cap. 2) Fill the fuel tank carefully. 3) Close the cap securely after refueling. 902055 Wipe up any spilled fuel. Fuel tank capacity: Refer to SPECIFICATIONS on Page 4-1. Ring Free Fuel Additive Gasoline is a precise blend of many differ- ent substances, each chosen to give cer-...

  • Page 48: Filling Oil

    While many additives available may reduce deposits, Yamaha recommends the use of Ring Free Fuel Additive, avail- able from your Yamaha dealer. Ring Free has repeatedly proven its ability to clean combustion deposits from inside the engine, notably the critical piston-ring- land area, and fuel system components.
  • Page 49 Manual start model 30MH 1) Remove the top cowling. 2) Open the oil tank filler cap by pulling the tab. 3) Slowly fill the engine oil into the engine oil tank. 4) After filling, replace the cap securely. 5) Replace the top cowling securely. 203012* 1 Engine oil tank 2 Oil tank filler cap...

  • Page 50: Gasoline (Petrol) And Oil Mixing

    EMF35011 GASOLINE (PETROL) AND OIL MIXING Pre-mix model Engine oil : Gasoline (Petrol) Break-in period 1 : 25 After break-in 1 : 100 1) Pour oil and gasoline into the fuel tank, in that order. 1 Engione oil 2 Gasoline (Petrol) 2) Then mix the fuel thoroughly by shak- ing.
  • Page 51 Mixing ratio 25 : 1 12 L 14 L 24 L Gasoline (Petrol) (0.26 US gal, (3.2 US gal, (3.7 US gal, (6.3 US gal, 0.22 Imp gal) 2.6 Imp gal) 3.1 Imp gal) 5.3 Imp gal) 0.04 L 0.48 L 0.56 L 0.96 L Engine oil...

  • Page 52: Pre-Operation Checks

    MU00204 PRE-OPERATION CHECKS If any item in the pre-operation check is not working properly, have it inspected and repaired before operating the out- board motor. Otherwise, an accident could occur. Do not start the engine out of water. Overheating and serious engine damage can occur.

  • Page 53: Operation After A Long Period Of Storage

    3) Watch for oil flowing through the oil feed pipes. After any air in the oil lines has been expelled, YAMAHA PRECISION BLEND SYSTEM should supply oil normally. If no oil has begun flowing after 10 minutes of idling, consult your Yamaha dealer.

  • Page 54: Breaking In (Running In) Engine

    EMF50211 BREAKING IN (RUNNING IN) ENGINE Your new engine requires a period of break-in (running-in) to allow mating sur- faces of moving parts to wear-in evenly. Correct break-in (running-in) will help ensure proper performance and longer engine life. 8 Failure to follow the break-in (running- in) procedure may result in reduced engine life or even severe engine dam- age.
  • Page 55 Make sure to mix gasoline (petrol) and oil completely, otherwise your outboard motor may be damaged. EMU00229 Run the engine under load (in gear with a propeller installed) as follows. 1) First 10 minutes: Run the engine at the lowest possi- ble-speed.

  • Page 56: Starting Engine

    Precision Blend System model 5) After the first 10 hours: Operate the engine normally. Use straight gasoline (petrol) in the fuel tank; YAMAHA PRECISION BLEND SYSTEM provides proper lubrication for normal operation. EMU01147 STARTING ENGINE 8 Before starting the engine, make sure that the boat is tightly moored and that you can steer clear of any obstructions.
  • Page 57 1) If there is an air vent screw on the fuel tank cap, loosen it 2 or 3 turns. 902053 2) If there is a fuel joint on the motor, 25-3/30 firmly connect the fuel line to the joint. Then firmly connect the other end of the fuel line to the joint on the fuel tank.
  • Page 58 5) Place the throttle control grip in the “START” position. 503022 6) Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg. Then, install the lock plate on the other end of the lanyard in the engine stop switch.
  • Page 59 8) Pull the starter handle slowly until you feel resistance. Then, give a strong pull straight out to crank and start the engine. Repeat it, if neces- sary. 9) After the engine starts, return the starter handle slowly to the original position before releasing it.
  • Page 60 10) Return the throttle control grip slowly to the fully closed position so that the engine does not stall. 8 Never push the starter-switch while the engine is running. 8 Do not keep the starter motor turning for more than 5 seconds. If the starter- 503012 motor is turned continuously for more than 5 seconds, the battery will be...
  • Page 61 8 Attach the engine stop switch lanyard to a secure place on your clothing, your arm or leg while operating. 8 Do not attach the lanyard to clothing that could tear loose. Do not route the lanyard where it could become entan- gled, preventing from functioning.
  • Page 62 8) Press in and hold the main switch to operate the remote choke system. (The remote choke switch returns to START its home position when you release your hand. Therefore, keep the switch pressed in.) NOTE: 8 It is not necessary to use the choke when the engine is warm.

  • Page 63: Warming Up Engine

    EEMG00010 WARMING UP ENGINE 1) Before beginning operation, allow the engine to warm up at idling speed for 3 minutes. (Failure to do this will shorten engine life.) 2) Check for a steady flow of water from the cooling-water pilot hole. A continuous flow of water from the pilot hole shows that the water pump is pumping water through the cooling pas-...

  • Page 64: Shifting

    MG20710 SHIFTING Before shifting, make sure there are no swimmers or obstacles in the water near you. To change the shifting position from for- ward to reverse or vice-versa, close the throttle first so that the engine idles (or runs at low speeds). FORWARD Tiller control model 1) Place the throttle control grip in the...

  • Page 65: Reverse

    EMU01326 REVERSE When operating in Reverse, go slowly. Do not open the throttle more than half. Oth- erwise, the boat may become unstable, which could result in loss of control and an accident. 503012 1) Place the throttle control grip in the fully closed position (for Tiller control 25-3/30 model).

  • Page 66: Stopping Engine

    EEMG38010 STOPPING ENGINE Let it cool off for a few minutes at idle or low speed first. Stopping the engine immediately after operating at high speed is not recommended. 407016* EMU00277 25-3/30 1) Push and hold the engine stop button or turn the main switch to “OFF”.

  • Page 67: Trimming Outboard Motor

    EMU01412 TRIMMING OUTBOARD MOTOR The trim angle of the outboard motor helps determine the position of the bow of the boat in the water. The correct trim angle will help improve performance and fuel economy while reducing strain on the engine.

  • Page 68: Adjusting Trim Angle

    ADJUSTING TRIM ANGLE EMU00951 Manual tilt model There are 4 or 5 holes provided in the clamp bracket to adjust the outboard motor trim angle. 1) Stop the engine. 2) Remove the trim angle adjusting rod 1 from the clamp bracket while tilting 404022* the motor up slightly.
  • Page 69 EMU00282 Bow Up When the boat is on plane, a bow-up atti- tude result in less drag, greater stability and efficiency. This is generally when the keel line of the boat is up about 3 to 5 degrees. When trimmed out, the boat may have more tendency to steer to one side or the other.

  • Page 70: Cruising In Shallow Water

    EMG70011 CRUISING IN SHALLOW WATER Manual tilt model The outboard motor can be tilted up par- tially to allow operation in shallow water. 000832 8 Place the gear shift in the Neutral posi- tion before using the shallow water cruising system. 8 Run the boat at the lowest possible speed when using the shallow water cruising system.
  • Page 71 3) Pull up the shallow water lever. 4) Slightly tilt up the engine. The tilt- support bar will lock automatically, supporting the engine in a partially raised position. NOTE: If the engine is tilted up completely, the tilt-lock lever automatically locks. The shallow water lever is no longer effective.

  • Page 72: Tilting Up/Down

    EMH10110 TILTING UP/DOWN If the engine will be stopped for some time, or if the boat is moored in shallows, the engine should be tilted up to protect the propeller and casing from damage by collision with obstructions, and also to reduce salt corrosion.
  • Page 73 EMG63910 PROCEDURE FOR TILTING UP 1) Place the gear shift lever in Neutral. 2) Remove the fuel line connection from the motor. 406012 3) Push the tilt lock lever to release. 402061** 4) Pull up the shallow water lever. 402075* 5) Hold the rear of the top cowling with one hand and fully tilt the engine up.

  • Page 74: Procedure For Tilting Up/Down

    EMG63010* PROCEDURE FOR TILTING UP 25-3/30 1) Remove the fuel-line connection from the motor. (If the fuel connector is provided on the motor.) 2) Place the tilt-lock lever in Release. 402035 3) Hold the rear of the top cowling with one hand, tilt the engine up, and turn the tilt-support lever to the locked position and support the engine.

  • Page 75: Cruising In Other Conditions

    EMH60010 CRUISING IN OTHER CONDITIONS CRUISING IN SALT WATER After operating in salt water, wash out the cooling-water passages with fresh water to prevent them from becoming clogged- up with salt deposits. NOTE: Refer to cooling system flushing instruc- tions in “TRANSPORTING AND STORING OUTBOARD MOTOR”.
  • Page 76 -MEMO-...

  • Page 77: Maintenance

    EMK00010 Chapter 4 MAINTENANCE SPECIFICATION DATA......4-1 TRANSPORTING AND STORING OUTBOARD MOTOR .......4-4 Trailering outboard motor....4-4 Storing outboard motor ......4-5 PERIODIC MAINTENANCE....4-10 Replacement parts ......4-10 Maintenance chart......4-11 Cleaning and adjusting spark plug..4-12 Checking fuel system......4-14 Inspecting fuel filter ......4-15 Adjusting idling speed.......4-16 Checking water drain under engine oil tank ........4-17 Replacing fuse ........4-18...

  • Page 78: Specification Data

    EMK10011* SPECIFICATION DATA Model Unit 25MHA Item DIMENSIONS 8Overall Length mm (in.) 936 (369) 8Overall Width mm (in.) 358 (14.1) 8Overall Height mm (in.) 1,068 (42.0)/1,195 (47.0) 8Transom height mm (in.) 419 (16.5)/546 (21.5) 8Weight kg (lb.) 49.0 (108.0)/50.5 (111.3) PERFORMANCE 8Full throttle operating range r/min...
  • Page 79 25MHA3 30MHA 30EHA 993 (39.1) 993 (39.1) 993 (39.1) 360 (14.2) 360 (14.2) 360 (14.2) 1,158 (45.6)/— 1,158 (45.6)/1,279 (50.4) — /1,279 (50.4) 424 (16.7)/— 424 (16.7)/545 (21.5) — /545 (21.5) 59.0 (130.1)/— 60.0 (132.3)/62.0 (136.7) — /64.5 (142.2) 4,500~5,500 4,500~5,500 4,500~5,500 18.4 (25) at 5,000 r/min...
  • Page 80 EMK10011* SPECIFICATION DATA Model Unit 30ERA Item DIMENSIONS 8Overall Length mm (in.) 662 (26.1) 8Overall Width mm (in.) 307 (12.1) 8Overall Height mm (in.) — /1,261 (49.6) 8Transom height mm (in.) — /545 (21.5) 8Weight kg (lb.) — /62.0 (136.7) PERFORMANCE 8Full throttle operating range r/min...

  • Page 81: Transporting And Storing Outboard Motor

    EMU01369* TRANSPORTING AND STORING OUTBOARD MOTOR Leaking fuel is a fire hazard. When trans- porting and storing the outboard motor, close the air vent screw and fuel cock to 000929 prevent fuel from leaking. TRAILERING OUTBOARD MOTOR The motor should be trailered and stored in the normal running position.

  • Page 82: Storing Outboard Motor

    EMK16010 STORING OUTBOARD MOTOR When storing your Yamaha outboard for prolonged periods of time, (2 months or longer), several important procedures must be performed to prevent expensive damage. This is especially important for...
  • Page 83 “Yamaha Fuel Conditioner and Stabilizer” (Part No. LUB-FUELC-12- 00) to each gallon of fuel. NOTE: The use of “Yamaha Fuel Conditioner and Stabilizer” eliminates the need to drain the fuel system. Consult your Yamaha dealer or other qualified mechanic if the fuel system is to be drained instead.
  • Page 84 5) Turn off the engine and water supply. EMK26111 Lubrication 1) Remove the spark plugs, and spray a 10 second spray of “Yamaha Stor- Rite Engine Fogging Oil” into each cylinder. Grease spark plug threads and reinstall the spark plugs and torque to proper specification.
  • Page 85 1) Wash down the exterior of the out- board with fresh water and dry off completely. 2) Spray the engine’s exterior with “Yamaha Silicone Protectant” (Part No. LUB-SILCNE-13-00). 3) Wax the cowling with a non-abrasive wax such as “Yamaha Silicone Wax” (Part No. ACC-11000-15-02).
  • Page 86 EMU00353 Battery Care Battery electrolyte is poisonous and dan- gerous, causing severe burns, etc. It con- tains sulfuric acid. Avoid contact with skin, eyes, or clothing. Antidote: EXTERNAL; Flush with water. INTERNAL; Drink large quantities of water or milk. Follow with milk of mag- nesia, beaten egg, or vegetable oil.

  • Page 87: Periodic Maintenance

    If the owner is not familiar with machine servicing, this work should be done by a Yamaha dealer or other quali- fied mechanic. A service manual is available for purchase through a Yamaha dealer for owners who...

  • Page 88: Maintenance Chart

    Frequency of maintenance operations may be adjusted according to the operating con- ditions, but the following table gives general guidelines. The mark (7) indicates the check-ups which you may carry out yourself. The mark (2) indicates work to be carried out by your Yamaha dealer. Initial Every...

  • Page 89: Cleaning And Adjusting Spark Plug

    Do not attempt to diagnose any problems yourself. Instead, take the outboard motor to a Yamaha dealer. You should periodically remove and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode.
  • Page 90 When fitting the plug, always clean the gasket surface and use a new gasket. Wipe off any dirt from the threads and screw in the spark plug to the correct torque. Spark plug torque: Refer to “SPECIFICATIONS”, page 4-1. NOTE: If a torque-wrench is not available when you are fitting a spark plug, a good esti- mate of the correct torque is 1/4 to 1/2 a...

  • Page 91: Checking Fuel System

    EMK38010 CHECKING FUEL SYSTEM Gasoline (petrol) and its vapors are highly flammable and explosive. Keep away from sparks, cigarettes, flames or other sources of ignition. Check the fuel line for leaks, cracks, or malfunctions. If any problem is found, it should be repaired immediately by Yama- 25-3/30 ha dealer or other qualified mechanic.

  • Page 92: Inspecting Fuel Filter

    Gasoline (petrol) is highly flammable, and its vapors are flammable and explosive. 8 If you have any question about properly doing this procedure, consult your Yamaha dealer. 8 Do not perform this procedure on a hot or running engine. Allow the engine to cool.

  • Page 93: Adjusting Idling Speed

    5) Attach the filter assembly to the bracket with that the fuel hoses are attached to the filter assembly. 6) Run the engine and check the filter and lines for leaks. 1 Filter element 2 O-ring 3 Filter cap 4 Filter housing 207013* EMU00376 ADJUSTING IDLING SPEED...

  • Page 94: Checking Water Drain Under Engine Oil Tank

    If not warmed up fully, the speed setting 25-3/30 will tend to be too high. If you have diffi- culty obtaining the specified idle, consult a Yamaha dealer or other qualified mechanic. 1 Throttle stop-screw EMK58010 CHECKING WATER DRAIN UNDER...

  • Page 95: Replacing Fuse

    This could cause electrical system damage and a fire hazard. NOTE: If the new fuse blows again immediately, consult a Yamaha dealer. 1 Fuse holder 2 Fuse (10A) 205021 EMK78010 CHECKING WIRING AND...

  • Page 96: Greasing

    MU00366 GREASING Yamaha marine grease (Water resistant grease) 103141b 4-19...
  • Page 97 EMU00366 GREASING Yamaha marine grease (Water resistant grease) 25-3/30 103141a 4-20...
  • Page 98 EMU00366 GREASING Yamaha marine grease (Water resistant grease) 4-21...

  • Page 99: Checking Propeller

    EMU00388 CHECKING PROPELLER You could be seriously injured if the engine accidentally starts while you are near the propeller. 8 Before inspecting, removing installing the propeller, remove the 210012 spark plug caps from the spark plugs. Also, put the shift control in Neutral, put the main switch in the “OFF”...
  • Page 100 8 Be sure to use a new cotter pin and bend the ends over securely. Other- wise, the propeller could come off dur- ing operation and be lost. 1) Apply Yamaha Marine grease or Cor- rosion resistant grease to the pro- peller-shaft. 2) Install the thrust washer and propeller on the propeller-shaft.

  • Page 101: Changing Gear Oil

    Inspect the used oil after it has been drained. If the oil is milky, water is get- ting into the gear-case which can cause gear damage. Consult a Yamaha dealer 601021 for repair of the lower unit seals. 4-24...

  • Page 102: Cleaning Fuel Tank

    NOTE: For disposal of used oil consult your Yamaha dealer. 5) With the outboard motor in an verti- cal position, using a flexible or pres- surized filling device, inject the gear oil into the oil drain plug hole. 601022 Gear oil grade/capacity: Refer to SPECIFICATIONS on page 4-1.

  • Page 103: Inspecting And Replacing Anode(S)

    902054 EMU00831 INSPECTING AND REPLACING ANODE(S) Yamaha outboard motor is protected from corrosion by a sacrificial anode(s). Check the anode(s) periodically. Remove the scales from surfaces of the anode(s). For the inspection and replacement of the anode(s), consult a Yamaha dealer.

  • Page 104: Checking Battery

    EMU00404 CHECKING BATTERY (for Electric start model) Battery electrolytic fluid is dangerous; it contains sulfuric acid and therefore is poi- sonous and highly caustic. Always follow these preventive mea- sures: 8 Avoid bodily contact with electrolytic fluid as it can cause severe burns or permanent eye injury.
  • Page 105 8 A poorly maintained battery will quick- ly deteriorate. 8 Ordinary tap-water contains minerals harmful to a battery, and should not be used for topping-up. 1) Check the electrolyte level at least 901015 once a month. Fill to the manufactur- er’s recommended level when neces- sary.
  • Page 106 EMU01279 Connecting the Battery Mount the battery holder securely in a dry, well-ventilated, vibration-free loca- tion in the boat. Install a fully charged battery in the holder. 8 Make sure the main switch (on applica- ble models) is “OFF” before working on the battery.

  • Page 107: Checking Bolts And Nuts

    Check the motor for scratches, nicks, or flaking paint. Areas with damaged paint are more likely to corrode. If necessary, clean and paint the areas. Consult a Yamaha dealer for touch-up paint. 102031 EML44010 COATING THE BOAT BOTTOM A clean hull improves boat performance.
  • Page 108 -MEMO-...

  • Page 109: Trouble Recovery

    EMN00010 Chapter 5 TROUBLE RECOVERY TROUBLESHOOTING ......5-1 TEMPORARY ACTION IN EMERGENCY ..........5-5 Impact damage........5-5 Starter will not operate ......5-6 Treatment of submerged motor ..5-8...

  • Page 110: Troubleshooting

    A problem in the fuel, compression, or ignition systems can cause poor starting, loss of power, or other problems. The troubleshooting chart describes basic checks and possi- ble remedies. (This chart covers all Yamaha outboard motors. Therefore, some items may not apply to your model.) If your outboard motor requires repair, bring it to a Yamaha dealer.
  • Page 111 3. Fill tank with clean, fresh fuel. 4. Fuel filter clogged. 4. Clean or replace filter. 5. Failed ignition parts. 5. Have serviced by a Yamaha dealer. 6. Warning system activated. 6. Find and correct cause of warning. 7. Spark plug gap incorrect.
  • Page 112 5. Engine oil contaminated or 5. Replace oil with fresh, specified sounds or deteriorated. type. indicator lamp 6. Oil filter clogged. 6. Have serviced by a Yamaha lights. dealer. 7. Oil feed/injection pump 7. Have serviced by a Yamaha malfunctions. dealer.
  • Page 113 13. Check wires for wear or breaks. ignition wiring. Tighten all loose connections. Replace worn or broken wires. 14. Failed ignition parts. 14. Have serviced by a Yamaha dealer. 15. Specified engine oil not used. 15. Check and replace oil with specified type.

  • Page 114: Temporary Action In Emergency

    . Also, inspect the boat damage . 3) However damage is found or not 607011 found, go back to a nearest harbor slowly and carefully. 4) Have a Yamaha dealer inspection of the outboard motor, before operating it again.

  • Page 115: Starter Will Not Operate

    EMU00423 STARTER WILL NOT OPERATE If the starter mechanism does not operate (engine cannot be cranked with the starter), the engine can be started with an emergency starter rope. 8 Use this procedure only in an emer- gency and only to return to port for repairs.
  • Page 116 EMU00950 Emergency Starting Engine 1) Remove the top cowling. 2) Remove the start-in-gear protection cable from the starter if equipped it. 3) Remove the starter/flywheel cover after removing the bolt(s). 208025 4) Prepare the engine for starting. See “STARTING ENGINE” for procedures. Be sure the engine is in Neutral and ON START that the lock plate is attached to the...

  • Page 117: Treatment Of Submerged Motor

    5) Take the outboard motor to a Yamaha dealer as soon as possible. Do not attempt to run the motor until it has been completely inspected.
  • Page 118 -MEMO-...

  • Page 119: Index

    EMP00010 Chapter 6 INDEX INDEX............6-1...
  • Page 120 Engine oil ..........1-11 EMP10010 INDEX Engine stop button ........2-5 Engine stop lanyard switch .....2-4, 2-9 Exhaust leakage ........4-18 Adjusting idling speed ......4-16 Adjusting trim angle......3-27 Filling fuel ..........3-6 Air vent screw...........2-3 Filling fuel and engine oil......3-6 Basic boating rules ........1-6 Filling fuel tank .........4-6 Filling oil............3-7 Battery care..........4-9...
  • Page 121 Mounting height ........3-3 Temporary action in emergency....5-5 Mounting the outboard motor ....3-2 Throttle control grip ........2-5 Throttle friction adjusting screw ..2-10 Throttle friction adjusting screw/knob...2-6 Neutral interlock trigger ......2-8 Throttle indicator ........2-5 Neutral throttle lever .......2-8 Tiller handle..........2-5 Oil level warning system.......2-16 Tilt lock mechanism.......2-12 Oil level warning/oil filter clogging Tilt support bar........2-13...
  • Page 122 1. Be sure your new Yamaha is registered for warranty. Your boat dealer should do this at the time of sale. Make sure your dealer gives you a copy of the completed Yamaha regis- tration card for your records.
  • Page 123 5. Your warranty applies specifically to repairs made in the country of purchase. If your U.S.-purchased Yamaha needs warranty service while in Canada, or your Canadian pur- chased Yamaha needs service while in the United States, Yamaha will assist the local dealer whenever possible. However, some products available in one country may not be sold or serviced in the other.
  • Page 124 Owner’s Manual. The owner of the outboard motor shall give notice to an authorized Yamaha marine dealer of any and all apparent defects within ten (10) days of discovery and make the motor available at that time for inspection and repairs at the dealer’s place of business.
  • Page 125 TRANSFER OF WARRANTY. Transfer of the warranty from the original purchaser to any subsequent purchaser is possible by having the motor inspected by an authorized Yamaha outboard dealer and requesting the dealer to submit a change of registration to Yamaha Motor Corporation, U.S.A.
  • Page 126 The federal government requires each manufacturer of a motor vehicle to maintain a complete, up-to-date list of all first purchasers against the possibility of a safety-related defect and recall. This list is complied from the purchase registrations sent to Yamaha Motor Corporation, U.S.A.
  • Page 127 Yamaha outside the U.S.A. or Canada, please contact an autho- rized Yamaha dealer in your country. Keep a copy of your sales contract or invoice for the purchase of your Yamaha and present it if you need warranty repairs. This document should show the date of purchase, which is important evidence the repairing dealer will need to be sure your Yamaha is covered by warranty.
  • Page 130 Printed in Japan April 2001—1.0 1! 6L2-28199-1H (25NMH/25JMH/30DMHO/30DEHO/30DEO) Printed on recycled paper...

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